<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <style>
            * {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }
            body {
                background-color: rgb(4, 15, 36);
            }
            h3 {
                position: absolute;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                width: 100%;
                text-align: center;
                font-size: 3em;
                text-transform: uppercase;
                letter-spacing: 10px;
                color: rgb(4, 15, 36);
                -webkit-box-reflect: below 1px linear-gradient(transparent, rgb(218, 218, 218));
                animation: san 6s linear infinite;
            }
            /* 设置不同时间段显示不同颜色等实现闪烁霓虹灯效果 */
            @keyframes san {
                0%,
                15%,
                50%,
                52%,
                70%,
                90%,
                99.1% {
                    color: rgb(4, 15, 36);
                    filter: blur(2px);
                }
                12%,
                15.1%,
                60%,
                70.1%,
                90.5%,
                100% {
                    color: rgb(255, 255, 255);
                    /* 阴影叠加，效果更亮 */
                    text-shadow: 0 0 5px rgb(22, 138, 216), 0 0 25px rgb(22, 138, 216), 0 0 35px rgb(22, 138, 216), 0 0 105px rgb(22, 138, 216), 0 0 155px rgb(22, 138, 216);
                    filter: blur(0px);
                }
            }
        </style>
    </head>
    <body>
        <h3>Aurora Borealis night</h3>
    </body>
</html>
